IOTA/IOTA-ES occultation update for (1606) Jekhovsky / TYC 0709-00538-1 event on 2008 Dec 07, 08:56 UT Visible from Colombia, Ecuador Summary ------- On 2008 Dec 07 UT, the 26 km diameter asteroid (1606) Jekhovsky will occult a 9.0 mag star in the constellation Orion for observers along a path across Colombia, Ecuador. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.9 mag to 15.9 mag (the magnitude of the asteroid) for at most 2.0 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 34 * date and approx. time of event: 2008 Dec 07, 08:48 - 2008 Dec 07, 09:04 UT * magnitude of target star: 9.0 * magnitude drop [mag]: 6.9 * estimated maximum duration [s]: 2.0 * Moon: 65 % sunlit, 82° distance * Sun: 166° distance * rough path description: Colombia, Ecuador The occultation path -------------------- * approximate projected width [km]: 26 * 1 sigma uncertainty interval [path widths]: +/- 1.93 * 1 sigma uncertainty interval [seconds]: +/- 5.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .053 +/- .041) * 1 sigma uncertainty ellipse (major, minor, PA): ( .053", .041", 86° ) * approx speed of asteroid's shadow [km/s]: 13.0546 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0709-00538-1 by 1606 Jekhovsky on 2008 Dec 7 Centre Star Star Sun Path Limits Error Limits E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude 145 0 0 -15 54 24 9 4 14 0 78 -6 -15 47 4 -16 1 43 -15 18 50 .. .. .. 146 0 0 -15 41 30 9 4 14 1 77 -7 -15 34 11 -15 48 50 -15 5 55 -16 17 9 147 0 0 -15 28 30 9 4 14 2 77 -7 -15 21 10 -15 35 50 -14 52 54 -16 4 10 148 0 0 -15 15 22 9 4 14 3 77 -8 -15 8 2 -15 22 42 -14 39 45 -15 51 3 149 0 0 -15 2 8 9 4 13 4 76 -9 -14 54 48 -15 9 28 -14 26 30 -15 37 49 150 0 0 -14 48 47 9 4 12 5 76 -10 -14 41 27 -14 56 7 -14 13 9 -15 24 29 151 0 0 -14 35 20 9 4 12 6 76 -11 -14 27 59 -14 42 40 -13 59 41 -15 11 3 152 0 0 -14 21 47 9 4 11 7 76 -12 -14 14 26 -14 29 7 -13 46 7 -14 57 30 153 0 0 -14 8 8 9 4 9 8 75 -13 -14 0 47 -14 15 29 -13 32 27 -14 43 52 154 0 0 -13 54 23 9 4 8 9 75 -14 -13 47 3 -14 1 44 -13 18 42 -14 30 8 155 0 0 -13 40 34 9 4 7 10 75 -15 -13 33 13 -13 47 55 -13 4 52 -14 16 19 156 0 0 -13 26 39 9 4 5 11 75 -16 -13 19 18 -13 34 1 -12 50 57 -14 2 25 157 0 0 -13 12 40 9 4 4 12 75 -17 -13 5 19 -13 20 2 -12 36 57 -13 48 27 158 0 0 -12 58 37 9 4 2 13 74 -18 -12 51 15 -13 5 58 -12 22 53 -13 34 24 159 0 0 -12 44 29 9 4 0 14 74 -19 -12 37 8 -12 51 51 -12 8 45 -13 20 17 160 0 0 -12 30 17 9 3 58 15 74 -20 -12 22 56 -12 37 39 -11 54 33 -13 6 6 161 0 0 -12 16 2 9 3 55 16 74 -21 -12 8 41 -12 23 24 -11 40 18 -12 51 51 162 0 0 -12 1 44 9 3 53 17 73 -22 -11 54 22 -12 9 6 -11 25 59 -12 37 33 163 0 0 -11 47 23 9 3 50 18 73 -23 -11 40 1 -11 54 44 -11 11 37 -12 23 12 164 0 0 -11 32 58 9 3 48 19 73 -24 -11 25 37 -11 40 20 -10 57 13 -12 8 48 165 0 0 -11 18 32 9 3 45 20 73 -25 -11 11 10 -11 25 54 -10 42 46 -11 54 22 166 0 0 -11 4 3 9 3 42 21 73 -26 -10 56 41 -11 11 25 -10 28 17 -11 39 53 167 0 0 -10 49 33 9 3 39 22 72 -27 -10 42 11 -10 56 55 -10 13 46 -11 25 23 168 0 0 -10 35 0 9 3 35 23 72 -28 -10 27 38 -10 42 22 - 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83 0 0 4 17 45 8 50 52 48 283 -37 4 24 54 4 10 35 4 52 30 3 42 56 - 82 0 0 4 14 44 8 50 46 47 283 -36 4 21 53 4 7 34 4 49 29 3 39 55 - 81 0 0 4 11 28 8 50 40 46 283 -35 4 18 38 4 4 19 4 46 14 3 36 39 - 80 0 0 4 7 59 8 50 34 45 283 -34 4 15 8 4 0 49 4 42 45 3 33 9 - 79 0 0 4 4 15 8 50 28 44 283 -33 4 11 25 3 57 5 4 39 2 3 29 25 - 78 0 0 4 0 17 8 50 22 43 283 -32 4 7 27 3 53 7 4 35 5 3 25 26 - 77 0 0 3 56 5 8 50 17 42 283 -31 4 3 15 3 48 55 4 30 53 3 21 14 - 76 0 0 3 51 39 8 50 11 41 283 -30 3 58 49 3 44 29 4 26 28 3 16 47 - 75 0 0 3 46 59 8 50 6 40 282 -29 3 54 9 3 39 48 4 21 48 3 12 6 - 74 0 0 3 42 4 8 50 0 39 282 -28 3 49 15 3 34 54 4 16 54 3 7 11 - 73 0 0 3 36 56 8 49 55 38 282 -28 3 44 7 3 29 45 4 11 47 3 2 2 - 72 0 0 3 31 34 8 49 50 37 282 -27 3 38 45 3 24 23 4 6 25 2 56 39 - 71 0 0 3 25 58 8 49 45 36 282 -26 3 33 9 3 18 47 4 0 50 2 51 2 - 70 0 0 3 20 8 8 49 40 35 282 -25 3 27 19 3 12 57 3 55 1 2 45 11 - 69 0 0 3 14 4 8 49 35 34 282 -24 3 21 15 3 6 53 3 48 58 2 39 7 - 68 0 0 3 7 47 8 49 30 33 282 -23 3 14 58 3 0 36 3 42 42 2 32 49 - 67 0 0 3 1 16 8 49 26 32 282 -22 3 8 28 2 54 4 3 36 12 2 26 17 - 66 0 0 2 54 32 8 49 21 31 282 -21 3 1 43 2 47 20 3 29 28 2 19 31 - 65 0 0 2 47 34 8 49 17 30 282 -20 2 54 46 2 40 22 3 22 31 2 12 32 - 64 0 0 2 40 22 8 49 13 29 282 -19 2 47 35 2 33 10 3 15 21 2 5 20 - 63 0 0 2 32 58 8 49 9 28 282 -18 2 40 10 2 25 45 3 7 57 1 57 55 - 62 0 0 2 25 20 8 49 5 27 282 -17 2 32 33 2 18 7 3 0 21 1 50 16 - 61 0 0 2 17 29 8 49 1 26 282 -16 2 24 42 2 10 16 2 52 31 1 42 24 - 60 0 0 2 9 25 8 48 57 25 282 -15 2 16 38 2 2 12 2 44 28 1 34 19 - 59 0 0 2 1 8 8 48 54 24 282 -14 2 8 22 1 53 55 2 36 12 1 26 1 - 58 0 0 1 52 39 8 48 50 23 282 -13 1 59 52 1 45 25 2 27 44 1 17 30 - 57 0 0 1 43 57 8 48 47 22 282 -12 1 51 10 1 36 43 2 19 2 1 8 47 - 56 0 0 1 35 2 8 48 44 21 282 -11 1 42 15 1 27 48 2 10 9 0 59 51 - 55 0 0 1 25 54 8 48 41 20 282 -10 1 33 8 1 18 40 2 1 2 0 50 43 - 54 0 0 1 16 35 8 48 38 19 282 -9 1 23 49 1 9 20 1 51 44 0 41 22 - 53 0 0 1 7 3 8 48 35 18 282 -9 1 14 17 0 59 48 1 42 13 0 31 49 - 52 0 0 0 57 19 8 48 32 17 282 -8 1 4 34 0 50 4 1 32 30 0 22 4 - 51 0 0 0 47 23 8 48 30 16 282 -7 0 54 38 0 40 8 1 22 36 0 12 7 - 50 0 0 0 37 15 8 48 27 15 282 -6 0 44 31 0 30 0 1 12 29 0 1 58 - 49 0 0 0 26 56 8 48 25 14 282 -5 0 34 12 0 19 40 1 2 11 - 0 8 23 - 48 0 0 0 16 25 8 48 23 13 282 -4 0 23 41 0 9 9 0 51 42 - 0 18 55 - 47 0 0 0 5 43 8 48 21 12 282 -3 0 12 59 - 0 1 33 0 41 1 - 0 29 38 - 46 0 0 - 0 5 10 8 48 19 11 282 -2 0 2 6 - 0 12 26 0 30 9 - 0 40 32 - 45 0 0 - 0 16 14 8 48 18 10 282 -1 - 0 8 58 - 0 23 31 0 19 6 - 0 51 38 Uncertainty in time = +/- 5 secs [Prediction of 2008 Nov 26.0] Data for the target star ------------------------ * name: TYC 0709-00538-1 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 35 45.6470 DE: +11 57 48.327 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .019 ) * V mag [mag]: 9.0 * B mag [mag]: 9.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1606) Jekhovsky approx. diameter [km]: 26 approx. diameter ["]: .021 distance from Earth [AU]: 1.72100 * orbital information: orbit source: Preston date of fit: 2008 Oct 29 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 843 number of rejected observations: 36 time covered by the observations: 1906 Oct 13 - 2008 Oct 07 1 sigma uncertainty ellipse (major, minor, PA): 0.050, 0.036, 86° remarks: * orbital elements for (1606) Jekhovsky : Mean anomaly = 71.63855526 deg Arg. of pericenter = 142.28537547 deg Long. of node = 190.73209027 deg Inclination = 7.69472393 deg Eccentricity = 0.31438236 Semimajor axis = 2.69220694 AU Perihelion dist = 1.84582457 AU Mag: H = 11.91, G = 0.15 Epoch of elements : MJD 54807.37200000 TDT (2008 Dec 07.372) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Dec 7 1606 Jekhovsky 8h 56.2m UT 9.0 5 35 45.647 11 57 48.33TYC 0709-00538-1 9.3 15.9 26 2.0 1.721 -2.547 -4.54 -126.6159 11.964 43.85 -22.67 8.9367 0.01944 -0.15953 -7.31456 -0.88887 -0.00088 0.00111 2000 69.99370320081130.00000142.285375190.732090 7.6947240.31438236 2.6922069 1.845824612.2 5.00.15 RATE 2.2312150 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.053 0.041 86 2.93 0.040 0 54796.5020081207_0538-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 26, 23:51 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org